No. Bookings created on jetairways.com will use the original Debit / Credit card that was used at the time of ticketing to make any further payments on jetairways.com
After successful login into Manage Booking section, click on Update My Booking, where you can view your itinerary and update your JetPrivilege number, meal request and contact details.
No, a change to name is not permitted in Jet Airways. You would need to cancel your ticket and book a new ticket with the correct guest(s) name. Cancellation charges, if any, will be applicable accordingly.